refactor(iree): set CPU stack allocation limit as an LLVM target option

[AGindinson]

In order to systemically address exceeded stack allocation limit failures for the CPU pipeline, we first need a way of conveying the limit itself to the whole pipeline. Therefore, create a new context-wide attribute, as well as a bound CLI option to replace the one specific to LLVMCPUCheckIRBeforeLLVMConversionPass.

A further direction for improvement would be unit-testing all the target properties & corresponding CLI options on the basis of this PR.

[AGindinson]

• fix(iree-cpu): clamp WG-level tiles to fit the stack allocation limit #35
• refactor(iree): set CPU stack allocation limit as an LLVM target option #34 👈 (View in Graphite)
• integrate-iree-20250217

This stack of pull requests is managed by Graphite. Learn more about stacking.

[chrsmcgrr]

Can you add a small test that shows this new target option appear in the IR?

[AGindinson]

Can you add a small test that shows this new target option appear in the IR?

Done on a basic level, thanks. Locally, ctest -R iree/compiler/Codegen/LLVMCPU/test/ shows 100%.

[chrsmcgrr]

Just a small request, looks good.